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Dolby® Encoding and Monitoring
Advanced AC-4 Encoder Menu
The advanced parameters menu contains controls that determine whether certain settings and metadata values
are set automatically or manually, and, if set manually, the values of individual settings.
Please note the advanced menu scrolls within the web page and not all controls are visible at once. The screenshots
and control descriptions below are divided into "top" and "bottom" figures for ease of illustration and explanation.
Preferred Downmix Method
The Preferred Downmix Method control (7-2A) sets the downmixing metadata value for the downstream
decoder.
Auto: Uses the upstream metadata to set the preferred downmix
♦
Not Indicated: No instructions to the downstream decoder are specified, allowing the decoder or the end
♦
user to choose the downmix type
Lo/Ro: The Center and surround channel content is redirected to the Left and Right channels for playback in
♦
a system with only two speakers
PL: This is a Dolby Surround-compatible matrix-encoded downmix that contains content from all channels
♦
and downmixes them to the Left and Right channels; this downmix is intended to be decoded by a Dolby
Surround Pro Logic decoder which can extract the matrix-encoded content from the Left and Right channels
to produce a four- or five-channel output with mono surround channels
PLII: This is a Lt/Rt downmix that retains the stereo surround information from the original program; a
♦
Dolby Pro Logic II-compatible downmix is intended to be decoded by a Dolby Pro Logic II decoder.
Settings Mode
The Settings Mode control (7-2B) determines whether the device-specific DRC profiles (7-1C) and various
channel-specific downmix values (7-1D) are automatically or manually set.
When set to Auto, controls for device-specific DRC profiles as well as downmix modes are grayed out.
Selecting "Manual" allows DRC profiles to be individually set for Flat Panel televisions, Home Theater setups,
Portable Headphones, and Portable Speakers.
DRC profiles include:
Auto
♦
None
♦
Film Standard
♦
Film Light
♦
Likewise, downmix gain values ranging from -6dB to +3dB can be individually specified Lo/Ro Surround, Lo/Ro
Center, Lt/Rt Surround, and Lt/Rt Center Downmix configurations from a range of choices in each dropdown
menu. Setting any of these controls to "Auto" will allow them to be set by upstream metadata.
Music Standard
♦
Music Light
♦
Speech
♦
Chapter 7 | 33
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